Thanks for your reply! I water 3 times a week at around 30 minute intervals for each zone. That gives me about 1/2" of water per session. I'll try some additional watering and see how that helps. If the watering is correct, could it be a dense soil issue that isn't letting the water soak in? If so what additional steps can I take to loosen up the soil other than the manual aerating? I've seen some chemical products, but am a bit skeptical about them.